java实现对rar压缩包的解压

一、导入相关的依赖包

<dependency>
   <groupId>com.github.junrar</groupId>
   <artifactId>junrar</artifactId>
   <version>7.4.0</version>
</dependency>

二、实现相应的工具类

import com.github.junrar.Archive;
import com.github.junrar.UnrarCallback;
import com.github.junrar.exception.RarException;
import com.github.junrar.rarfile.FileHeader;
import com.xxx.xxx.xxx.xxx.WkcrWord;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.StringUtils;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.List;

@Slf4j
public class UnRarFileUtil {

    /**
     * @param rarFileName rar file name
      * @param rarFileName rar file name
     * @param outFilePath output file path
     * @param callback callback
     * @throws Exception
     */
    public static List<WkcrWord> unrar(File f,String rarFileName, String outFilePath, UnrarCallback callback) throws Exception {
       //解压文件的对象 
       Archive archive = new Archive(f, callback);
        if (archive == null) {
            throw new FileNotFoundException(rarFileName + " NOT FOUND!");
        }
        if (archive.isEncrypted()) {
            throw new Exception(rarFileName + " IS ENCRYPTED!");
        }
        List<WkcrWord> wkcrWords=new ArrayList<>();
        List<FileHeader> files = archive.getFileHeaders();
        for (FileHeader fh : files) {
            if (fh.isEncrypted()) {
                throw new Exception(rarFileName + " IS ENCRYPTED!");
            }
            String fileName = fh.getFileName();
            //获取标准的文件名
            if(fileName.contains("\\")){
                fileName=fileName.substring(fileName.lastIndexOf("\\")+1);
            }
            if (fileName != null && fileName.trim().length() > 0) {
                String saveFileName = outFilePath  + fileName;
                File saveFile = new File(saveFileName);
                File parent = saveFile.getParentFile();
                if (!parent.exists()) {
                    parent.mkdirs();
                }
                if (!saveFile.exists()) {
                    saveFile.createNewFile();
                }

                FileOutputStream fos=null;
                if(saveFileName.contains(".doc")||saveFileName.contains(".docx")){
                    fos = new FileOutputStream(saveFile);
                    //获取返回的文件对象的集合
                    WkcrWord wkcrWord=new WkcrWord();
                    wkcrWord.setWordUrl(saveFileName);
                    wkcrWord.setName(fileName)；
                    wkcrWords.add(wkcrWord);
                }
                try {
                    if(!StringUtils.isEmpty(fos)){
                      //解压文件输出到对应的目录下
                        archive.extractFile(fh, fos);
                    }
                } catch (RarException e) {
                   throw new Exception("unrar error");
                } finally {
                    try {
                        if(!StringUtils.isEmpty(fos)){
                            fos.flush();
                            fos.close();
                        }
                    } catch (Exception e) {
                        //自定义抛出异常
                        throw new RuntimeException("close Exception");
                    }
                }
            }
        }
      //-----
        archive.close();
        return wkcrWords;
    }
}

三、方法的调用

List<WkcrWord> wkcrWords = UnRarFileUtil.unrar(f, modelNameAbsoulte, modelFilePath, new UnrarCallback() {
    int currentProgress = -1;

    @Override
    public boolean isNextVolumeReady(Volume volume) {
        return true;
    }
    @Override
    public void volumeProgressChanged(long l, long l1) {
      	//可以进行解压的百分比计算
        int progress = (int) ((double) l / l1 * 100);
        if (currentProgress != progress) {
            currentProgress = progress;
            log.info(progress + "%");
        }
    }
});